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Evaluation of Operational Factors Contributing to Reduced Recharge Capacity, North Boundary Treatment System, Rocky Mountain Arsenal, Commerce City, Colorado.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
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The North Boundary treatment system at Rocky Mountain Arsenal, Commerce City, Colorado, involves the pumping of contaminated ground water from an unconfined aquifer from one side of a soil bentonite slurry wall to three pulsed-bed activated carbon absorber and prefilter and postfilter systems. The treated water is injected into the unconfined aquifer on the other side of the slurry wall via 38 recharged wells and 15 recharged trenches, collectively referred to as the recharged system. Over time, the dewatering and especially the recharged system have a tendency to become clogged, which limits their effectiveness. A number of factors have been attributed to the degradation in performance of dewatering and recharged systems. These are air binding, sodium adsorption, metal precipitation, deposition of cementing agents, straining of suspended solids, and microbial growths or biofouling. This report presents the results of three separate assessments of reduced recharged capacity of a pump-and-treat system. The fate of carbon fines throughout the North Boundary system, clogging because of periodic losses of activated carbon fines, and growth of microorganisms in the recharged system are addressed.
APPROVED FOR PUBLIC RELEASE